Answer:
United States' imperialistic nature determined its foreign policy in the twentieth century.
Step-by-step explanation:
The American expansion in the Pacific in the nineteenth century was motivated by the commerce of East Asian countries like China and Japan. In the 1820s, considering the Monroe Doctrine, the United States proclaimed its control over the Western Hemisphere to avoid any further colonization by any foreign force. By 1902, America controlled many small islands in the pacific including Samosa, Alaska, the Philippines, Guam, etc. These strategic locations were important in carrying out their interest in East Asia. Moreover, they were inspired by the doctrine of the manifest of destiny to exert their control over foreign lands.